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Condensed Consolidated Statements of Operations Statement - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Income Statement [Abstract]
Product	$ 230,548	$ 204,389
Royalty and other revenue	1,116	8,564
Total revenue	231,664	212,953
Cost of goods sold	80,022	69,292
Gross profit	151,642	143,661
Selling, general and administrative	74,204	70,217
Research and development	21,415	19,559
Total operating expenses	95,619	89,776
Operating income	56,023	53,885
Non-operating income	3,886	1,647
Income before provision for income taxes	59,909	55,532
Provision for income taxes	10,587	9,902
Net income	$ 49,322	$ 45,630
Basic	$ 0.93	$ 0.88
Diluted	$ 0.87	$ 0.82
Basic	53,210	51,709
Diluted	56,799	55,496

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